/*************************************************************************************************
  Required Notice: Copyright (C) EPPlus Software AB. 
  This software is licensed under PolyForm Noncommercial License 1.0.0 
  and may only be used for noncommercial purposes 
  https://polyformproject.org/licenses/noncommercial/1.0.0/

  A commercial license to use this software can be purchased at https://epplussoftware.com
 *************************************************************************************************
  Date               Author                       Change
 *************************************************************************************************
  01/27/2020         EPPlus Software AB       Initial release EPPlus 5
 *************************************************************************************************/
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using OfficeOpenXml.FormulaParsing.Excel.Functions.Metadata;
using OfficeOpenXml.FormulaParsing.Exceptions;
using OfficeOpenXml.FormulaParsing.FormulaExpressions;

namespace OfficeOpenXml.FormulaParsing.Excel.Functions.Text
{
    [FunctionMetadata(
        Category = ExcelFunctionCategory.Text,
        EPPlusVersion = "4",
        Description = "Tests if two supplied text strings are exactly the same and if so, returns TRUE; Otherwise, returns FALSE. (case-sensitive)")]
    internal class Find : ExcelFunction
    {
        public override int ArgumentMinLength => 2;
        public override CompileResult Execute(IList<FunctionArgument> arguments, ParsingContext context)
        {
            var search = ArgToString(arguments, 0);
            var searchIn = ArgToString(arguments, 1);
            var startIndex = 0;
            if (arguments.Count > 2)
            {
                startIndex = ArgToInt(arguments, 2) - 1;
            }
            var result = searchIn.IndexOf(search, startIndex, System.StringComparison.Ordinal);
            if (result == -1)
            {
                return CompileResult.GetErrorResult(eErrorType.Value);
            }
            // Adding 1 because Excel uses 1-based index
            return CreateResult(result + 1, DataType.Integer);
        }
    }
}
